1156091857 has 2 divisors, whose sum is σ = 1156091858. Its totient is φ = 1156091856.

The previous prime is 1156091837. The next prime is 1156091861. The reversal of 1156091857 is 7581906511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153349521 + 2742336 = 33961^2 + 1656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156091857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1156091837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578045928 + 578045929.

It is an arithmetic number, because the mean of its divisors is an integer number (578045929).

Almost surely, 2^1156091857 is an apocalyptic number.

It is an amenable number.

1156091857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156091857 is an equidigital number, since it uses as much as digits as its factorization.

1156091857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 43.

The square root of 1156091857 is about 34001.3508114016. The cubic root of 1156091857 is about 1049.5362599174.

The spelling of 1156091857 in words is "one billion, one hundred fifty-six million, ninety-one thousand, eight hundred fifty-seven".